What Is a Seamless Stainless Steel TP317 Tube?
TP317 Seamless Stainless Steel Tube is supplied for higher molybdenum content than 316 for aggressive chemical service. The size range shown (OD 6–257 mm; WT 0.5–35 mm) is the overall capability across this product family, not a per-grade commitment. Confirm the specific OD × WT × length combination for the ordered grade in the quotation. The governing specification must be stated on the purchase order: ASTM A269 or ASTM A213 / ASME SA213, subject to service. Chemistry, mechanical properties, heat treatment, dimensional tolerance, NDT and certification must be reported against the ordered standard and material heat; do not treat typical values as guaranteed acceptance limits.
Manufactured through a seamless process (cold-drawn or hot-finished from a solid billet), TP317 tubes feature:
- No longitudinal weld seam
- Uniform microstructure
- Superior mechanical strength
- Enhanced pressure resistance
Compared to welded tubes, TP317 seamless tubes have no longitudinal weld seam, which is preferred where the design basis does not allow a weld joint efficiency factor.
Why Choose TP317 Stainless Steel Tube?
High Molybdenum Content (3.0% – 4.0%)
Improves resistance to:
- Pitting corrosion
- Crevice corrosion
- Chloride-induced attack
Improved Performance Over 316 Stainless Steel
TP317 is an upgraded version of 316/316L, offering:
- Better resistance to aggressive chemicals
- Longer service life in acidic environments
Excellent Thermal Stability
Maintains strength and oxidation resistance at elevated temperatures.
High Ductility & Fabrication Performance
- Easy to bend and form
- Ideal for heat exchanger tubing and complex piping systems
Key Advantages of TP317 Seamless Tube
1. Superior Corrosion Resistance
Performs exceptionally well in:
- Sulfuric acid
- Phosphoric acid
- Acetic acid
- Chloride-rich environments
2. High Pressure & Structural Integrity
The seamless construction has no longitudinal weld seam:
- No weld joint efficiency factor is applied in pressure design
- No longitudinal weld joint to assess for defects
- Service life depends on the actual service conditions and corrosion allowance
3. Excellent Mechanical Properties
Balanced strength and ductility for demanding industrial applications.
Product Specifications and Data
To provide a comprehensive overview of this high-performance material, here are the detailed technical specifications and performance data for Seamless Stainless Steel TP317 Tube.
Equivalent Grade
| UNS | Common grade name | EN material number | EN steel name | JIS grade | GB/T grade |
|---|---|---|---|---|---|
| S31700 | 317 | – (direct EN match not confirmed) | Not confirmed | SUS317 | 06Cr19Ni13Mo3 |
Grade correspondence does not make ASTM, ASME, EN, JIS and GB delivery requirements interchangeable. Confirm chemistry, heat treatment, mechanical properties, dimensions, testing and certification against the purchase specification. Approximate or unconfirmed correspondences retain their qualification. See the grade designation index.
Chemical Composition
The composition of Stainless Steel 317 is carefully balanced to achieve its superior corrosion resistance and high strength.
| Cr | Ni | P | S | Mo | Mn | Si | C |
|---|---|---|---|---|---|---|---|
| 18.00 – 20.00 | 11.00 – 15.00 | ≤ 0.045 | ≤ 0.030 | 3.00 – 4.00 | ≤ 2.00 | ≤ 1.00 | ≤ 0.08 |
Data source: ASTM A213-25 / ASME SA213 Table 1, TP317 row ≤ heat-analysis acceptance limits. Confirm the values against the ordered edition and the MTC.
Stainless Steel 317 is specifically designed to maintain its strength and shape in high-stress, corrosive environments.
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| ≥ 515 MPa | ≥ 205 MPa | ≥ 34% | ≤ 192 HBW / 200 HV / 90 HRB |
Typical Physical Properties
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
| Density | Melting Point | Thermal Expansion | Thermal Conductivity | Modulus of Elasticity | Electrical Resistivity |
|---|---|---|---|---|---|
| 8.0 g/cm³ | 1398 -1454 °C | 16.6 μm/m·°C (20-100°C) | 16.3 W/m·K (20°C) | 193 GPa | 0.74 × 10⁻⁶ Ω·m (20°C) |
Note: Typical values for reference only — not acceptance limits. Physical and mechanical properties are reported on the MTC against the ordered standard, product form and condition.
ASTM A1016/A1016M Tube Size Tolerance Chart
Size Tolerance Chart (mm)
| Specified Outside Diameter (OD) (Inches) | Permissible Variations in OD (± Inches) |
|---|---|
| 1⁄2 to 1 | ±0.005 |
| Over 1 to 1-1⁄2 | ±0.008 |
| Over 1-1⁄2 to 2 | ±0.010 |
| Over 2 to 2-1⁄2 | ±0.012 |
| Over 2-1⁄2 to 3-1⁄2 | ±0.014 |
| Over 3-1⁄2 to 5 | ±0.020 |
Tolerance basis: permitted variations per the governing specification stated on this page and the applicable general-requirements standard (ASTM A1016 / ASME SA1016) for the ordered product form; the wall-thickness and length variations in this section follow the same basis.
| Specified Outside Diameter (OD) (Inches) | Specified Wall Thickness (WT) (Inches) | Permissible Variation (± Inches) |
|---|---|---|
| 1⁄2 to 1 (Inclusive) | 0.025 to 0.065(Inclusive) | ±0.010 |
| Over 0.065to 0.134 (Inclusive) | ±0.012 | |
| Over 1 to 1-1⁄2 (Inclusive) | 0.025 to 0.065 (Inclusive) | ±0.010 |
| Over 0.065 to 0.134 (Inclusive) | ±0.012 | |
| Over 1-1⁄2 to 2 (Inclusive) | 0.025 to 0.049 (Inclusive) | ±0.011 |
| Over 0.049 to 0.083 (Inclusive) | ±0.012 | |
| Over 0.083 to 0.148 (Inclusive) | ±0.014 | |
| Over 2 to 2-1⁄2 (Inclusive) | 0.032 to 0.065 (Inclusive) | ±0.013 |
| Over 0.065 to 0.109 (Inclusive) | ±0.015 | |
| Over 0.109 to 0.165 (Inclusive) | ±0.017 | |
| Over 2-1⁄2 to 3-1⁄2 (Inclusive) | 0.032 to 0.165 (Inclusive) | ±0.020 |
| Over 0.165 to 0.220 (Inclusive) | ±0.025 | |
| Over 3-1⁄2 to 5 (Inclusive) | 0.083 to 0.165 (Inclusive) | ±0.025 |
| Over 0.165 to 0.220 (Inclusive) | ±0.030 |
Length Tolerance
For Specific Cut Lengths, the standard tolerance is +1⁄8 in. [3 mm], -0 in. [0 mm].
Important Note: The values presented here are based on the dimensional tolerance tables in ASTM A1016/A1016M (General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes), contains other essential requirements like straightness and details for tubes with ODs outside of this range. Always consult the latest official standard for design and procurement.
Size & Manufacturing Standards
We supply TP316LN seamless tubes in compliance with global standards:
- ASTM A213 / ASME SA213
- EN 10216-5
- ASTM A269
With strict control of:
- Outer diameter (OD) tolerance
- Wall thickness tolerance
- Surface finish and dimensional accuracy
Common Industrial Applications
TP317 seamless stainless steel tubes are widely used in:
Chemical & Petrochemical Industry
- Reactors
- Heat exchangers
- Acid handling systems
Pulp & Paper Industry
- Bleaching systems
- Digesters
Marine & Offshore Engineering
- Seawater cooling
- Desalination plants
Food Processing Industry
- High-acid production lines
- Hygienic piping systems
Pharmaceutical & Food Industry
- High-purity process piping
- CIP/SIP systems
Manufacturing Process & Quality Control
Production Process
- Billet Heating
- Piercing (hollow shell formation)
- Cold Drawing / Hot Finishing
- Solution Annealing (≥1040°C, rapid quenching)
- Straightening & Finishing
Quality Assurance & Testing
All TP317 seamless tubes undergo strict inspection:
Non-Destructive Testing (NDT)
- PMI (Positive Material Identification)
- Eddy Current Testing (ET)
- Ultrasonic Testing (UT)
- Hydrostatic Testing
Mechanical Testing
- Flattening Test
- Flaring Test
- Hardness Test
Corrosion Testing
- Intergranular Corrosion Test
- Pitting Resistance Test
Frequently Asked Questions
What sizes are available for TP317 seamless tube?
The overall range is OD 6–257 mm; WT 0.5–35 mm. Requirements outside this range are reviewed against mill capability on request.
Which specification governs TP317 seamless tube?
ASTM A269 or ASTM A213 / ASME SA213, subject to service is the governing specification for TP317 seamless tube. The edition in force at order time is stated on the quotation and purchase order; chemistry, mechanical properties, heat treatment, dimensions and testing are reported against the ordered standard and material heat.
What inspection documents are provided?
Each order is documented with a mill test certificate stating heat chemistry and mechanical test results. EN 10204 3.1 certification, hydrostatic testing, eddy-current or ultrasonic inspection and PMI are performed when specified in the purchase order.
Technical review: page data reviewed by the Xinzhe technical desk on 2026-09-27. Chemistry acceptance limits are compiled from the governing ASTM/ASME specification stated on this page; mechanical and physical values are typical reference data and are not acceptance guarantees. Values must be confirmed against the standard edition in force at order time and the material test certificate.
Ready to Request a Quotation?
Send the size (OD and wall or schedule), quantity, length, end finish and the inspection items you need as acceptance criteria — you will get a written quotation stating the specification and edition, delivery condition, documents included and lead time.
For the same grade in pipe form, see the TP317 seamless pipe. To compare other grades and size combinations, browse the Stainless Steel Seamless Pipe category. Minimum order quantity and lead time are confirmed on enquiry against the ordered grade, size and quantity.
